Archaeologists digging in the foothills of Iran's Zagros Mountains have discovered the remains of a Stone Age farming community. It turns out that people living there were growing plants like barley, peas and lentils as early as 12,000 years ago.

(Editor's note: U.S. and EU officials begin talks Monday on an ambitious free-trade agreement that promises to create thousands of new jobs and generate billions of dollars of new trade. But negotiators must overcome barriers created by cultural and philosophical differences over sectors like agriculture. One example, in Europe the cultivation of genetically modified crops is banned, while in the U.S., they are a central part of agricultural production. NPR's Jackie Northam visited a farm in Delaware and NPR's Eleanor Beardsley one in Burgundy, France, to look at just how deep-seated some of these differences are.)